CN103618472B - There is all solid state high voltage pulse current source that unipolar pulse exports - Google Patents
There is all solid state high voltage pulse current source that unipolar pulse exports Download PDFInfo
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- CN103618472B CN103618472B CN201310414678.XA CN201310414678A CN103618472B CN 103618472 B CN103618472 B CN 103618472B CN 201310414678 A CN201310414678 A CN 201310414678A CN 103618472 B CN103618472 B CN 103618472B
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Abstract
The invention belongs to power technique fields, be specifically related to a kind of all solid state high voltage pulse current source that there is unipolar pulse and export.The solid high-voltage pulse current source that unipolar pulse of the present invention exports, in series by basic discharge cell, and by using inductance and high-voltage diode, making the constant current hold in load, its magnitude of voltage is determined by load characteristic and inductive current parameter simultaneously simultaneously.When testing for impulse withstand voltage, power supply does not affect by load short circuits situation; For test pressure-sensitive device withstand voltage time, can effectively provide stable pulse current.
Description
Technical field
The invention belongs to power technique fields, be specifically related to a kind of all solid state high voltage pulse current source that there is unipolar pulse and export.
Background technology
Along with the development of Pulse Power Techniques, the application in high-voltage pulse current source is also more and more extensive, except the laser pumping of routine, ion implantation materials modification, spark machined, switch electrode are aging and except gas discharge related application, the pulse characteristic research of some high-low voltage devices also causes extensive concern, the impulse withstand voltage characteristic of such as material and device.The device that current test is withstand voltage is main mainly with DC high-voltage power supply, and when relating to impulse withstand voltage, the impulse voltage generator that adopts as high-voltage generator more.
Conventional power electronic technology obtains pulse current and mainly adopts inductance in conjunction with the method for disconnect, on the one hand, because existing disconnect is generally low-voltage device, often pulse surge is produced while turn-off current, after Overvoltage Amplitude exceedes the withstand voltage of switching device, easily there is punch through damage in switching device, therefore conventional pulse current source disconnect needs to add overvoltage protection or peak voltage absorbing circuit; On the other hand, force down because power-supply system is resistance to, cause conventional technology to be difficult to be used in the occasion not only needing high pressure but also need pulse current, and the disconnect of high pressure is also immature at present, and stability not, restricted lifetime.The impulse voltage generator used in high pressure occasion adopts Marx structure, whole device is made up of capacitor, isolation resistance (or inductance) and spark gap, the pulse voltage waveform produced is difficult to control, amplitude is difficult to regulate, output current is uncontrollable, be difficult to meet the demands in accurate test occasion, such as, in the test of high pressure pressure cell, often not only need high pressure but also need to have comparatively constant output current.Typical high-voltage pulse current source often needs disconnect to realize, and high-tension cut-off switch exists action instability at present, and the shortcomings such as the life-span is shorter, are difficult to obtain good Output rusults, thus affect test result.
Summary of the invention
The object of the present invention is to provide the unipolarity solid high-voltage pulse current source that length of a kind of life-span, failure rate is low, output adjustability are good.
The solid high-voltage pulse current source that the unipolar pulse that the present invention proposes exports, in series by basic discharge cell, and by using inductance and high-voltage diode, making the constant current hold in load, its magnitude of voltage is determined by load characteristic and inductive current parameter simultaneously simultaneously.Charhing unit receives capacitor two ends in discharge cell, and is its charging; Discharge cell at different levels is connected in series and forms voltage superposition electricity part; High-voltage diode and inductance form perceptual energy storage section; Load and high-voltage diode energy absorbing portion in series.Voltage superposition part, perceptual energy storage section and energy absorbing portion three are connected in parallel.When testing for impulse withstand voltage, power supply does not affect by load short circuits situation; For test pressure-sensitive device withstand voltage time, can effectively provide stable pulse current.The elementary cell number of wherein connecting does not have the upper limit, can combine as required.
In the present invention, basic discharge cell is connected and composed through circuit by switching device (as IGBT, MOSFET), diode and capacitor, and basic discharge cell contains 2 switching devices, 2 switch drive, 2 diodes and 1 capacitor; 1 switching device and 1 Diode series form a brachium pontis, and 2 brachium pontis of 2 switching devices and 2 diode compositions are connected in parallel, and tie point in parallel is the output of this discharge cell; Capacitor connects then to a 2 brachium pontis breaker in middle device and the common port of diode; Switch drive is connected to switching device driving stage, to provide drive singal.By the break-make of control switch device, the capacitor in each discharge cell is made to be together in series to inductive discharge, thus make inductive energy storage, when the controlled disconnection of switching device makes, inductance can carry out afterflow by load, thus high pressure is obtained in load, simultaneously because its electric current can not be undergone mutation, therefore at short notice, the current value in load is constant, if load short circuits, short circuit current is no more than the maximum of inductive current.Power supply can adjust potential pulse by the operating state controlling each discharge cell, thus controls inductive current.Also one or more discharge cell can be made not work, do not affect the normal operation of other discharge cells simultaneously, change with this amplitude exporting pulse.Meanwhile, circuit inherent characteristic makes the inefficacy of discharge cell that the unbalanced situation of switching device dynamic voltage balancing can not occur, and is conducive to safe and reliable operation and the maintenance of solid high-voltage pulse current source.
The present invention compared with prior art has following advantage:
1. power-supply system is formed by low-voltage device, and system is safer, and cost is lower;
2. the semiconductor switch device in discharge cell can not face the danger of over-voltage breakdown in turn-on and turn-off process.The fault of single discharge cell can not have an impact to the normal operation of other switches;
3. the use of switching device, makes power supply output parameter can adjust in a big way, is beneficial to correlative study work;
4. system configuration makes electric power output voltage there is maximum, not easily occurs overpressure situation;
5., because circuit exists energy absorption function, the dump energy stored in inductance can be used effectively.
Accompanying drawing explanation
Fig. 1 is unipolarity solid high-voltage pulse current source execution mode structure chart.
Number in the figure:
101,102,103-capacitor or Capacitor banks, charge storage cell as known in electrochemical capacitor, ceramic condenser, thin-film capacitor, safety electric capacity and pulse forming network etc.;
111,112,113,114,115,116-switching device (discharge switch), switching device as known in BJT, controllable silicon, IGBT, MOSFET, GTO, IGCT, all kinds of thyratron and gas switch etc., usually this switch internal needs an integrated anti-paralleled diode, also can be additional;
121,122,123,124,125, the drive circuit unit of 126-discharge switch or circuits for triggering unit, various driving circuits for triggering or driving chip;
131,132,133,134,135,136-drive signal line, provide signal to switch drive unit by magnetic coupling or coupling fiber;
141,142,143,144,145,146-fly-wheel diode, the silicon stack that various types of diodes or Diode series are formed;
151,152,153-capacitor charging unit at different levels;
161,162-high-voltage diode or silicon stack;
171-inductance, all kinds of known iron inductance or air core inductor;
181-load.
Embodiment
The present invention relates to a kind of implementation method of pulse current source.Synchronously open-minded with semiconductor switch, the capacitor of low pressure is together in series to inductive discharge, thus generation current pulse, when switching device turns off, inductance passes through oad freewheels, load produces high-voltage pulse, and because inductive current can not suddenly change, in load, high-voltage pulse amplitude is determined by load characteristic.
Embodiments of the present invention instantiation is using three grades of discharge cell series connection as basic structure, and in practical application, the series connection progression of discharge cell also can increase and decrease as required flexibly.It is described below:
In Fig. 1 illustrated embodiment, in figure, basic discharge cell has three, forms voltage superposition part after its series connection; High-voltage diode and inductance perceptual energy storage section in series; High-voltage diode and load in series even form energy absorbing portion; Three part in parallel connect.Basic discharge cell contains 2 switching devices, 2 switch drive, 2 diodes and 1 capacitor; 1 switching device and 1 Diode series form a brachium pontis, and 2 brachium pontis of 2 switching devices and 2 diode compositions are connected in parallel, and tie point in parallel is the output of this discharge cell; Capacitor connects then to a 2 brachium pontis breaker in middle device and the common port of diode; Switch drive is connected to switching device driving stage, to provide drive singal.Charhing unit at different levels exports two ends and receives capacitor two ends and charge to it.Charhing unit (151 ~ 153) charges respectively to capacitor (101 ~ 103).When after capacitor (101 ~ 103) voltage stabilization, if switch drive (121 ~ 126) sends drive singal to switching device (111 ~ 116) respectively, then capacitor (101 ~ 103), switching device (111 ~ 116), high-voltage diode (161) and inductance (171) form electrion loop, (171) bear positive pulse voltage to inductance, now inductance (171) is upper there is downward electric current, and its value increases gradually.Meanwhile, because high-voltage diode (162) is in reverse-biased, load (181) there is no high pressure and produce.Switching device (111 ~ 116) service time is longer, and the electric current on inductance (171) is larger, but its peak value is also limited by the capacity limit of capacitor (101 ~ 103), and in Power Management Design process, capacitor's capacity should be got greatly as far as possible.
In the charging process of inductance (171), if when switch drive (121 ~ 126) sends the drive singal set low, switching device (111 ~ 116) turns off, now inductance (171), high-voltage diode (161,162) and load (181) forms continuous current circuit, now load produces negative high voltage, period, its electric current can continuous decrease to zero due to load consumption energy.In the charging process of inductance (171), if switching device (111,113,115) turns off prior to switch (112,114,116), then inductance (171) will pass through switching device (112,114,116) and fly-wheel diode (142,144,146) afterflow; In the charging process of inductance (171), if switching device (112,114,116) turns off prior to switching device (111,113,115), then inductance (171) will pass through switching device (111,113,115) and fly-wheel diode (141,143,145) afterflow; In above two processes, inductive current remains unchanged substantially, but owing to there is loss in continuous current circuit, therefore its current value still can reduce.
In circuit of the present invention, the control signal (131 ~ 136) provided needed for switch driving section needs to isolate equally, usually adopts optical fiber, optocoupler or magnet ring to isolate.By adjustment switch (111 ~ 116) and the position of fly-wheel diode (141 ~ 146) and the polarity of high-voltage diode (161,162), the direction exporting pulse current can be changed.By suitable control mode, the pulse current of random waveform can be obtained in load.
Claims (1)
1. all solid state high voltage pulse current source that there is unipolar pulse and export, it is characterized in that by basic discharge cell in series, and by using inductance and high-voltage diode, making the constant current hold in load, its magnitude of voltage is determined by load characteristic and inductive current parameter simultaneously simultaneously; Charhing unit receives capacitor two ends in discharge cell, and is its charging; Discharge cell at different levels is connected in series and forms voltage superposition part; High-voltage diode and inductance form perceptual energy storage section; Load and high-voltage diode energy absorbing portion in series; Voltage overlaying circuit unit, perceptual energy storage section and energy absorbing portion three are connected in parallel;
Wherein, described basic discharge cell is connected and composed through circuit by switching device, switch driving circuit, diode and capacitor, and basic discharge cell contains 2 switching devices, 2 switch drive, 2 diodes and 1 capacitor; 1 switching device and 1 Diode series form a brachium pontis, and 2 brachium pontis of 2 switching devices and 2 diode compositions are connected in parallel, and tie point in parallel is the output of this discharge cell; Capacitor is connected to the common port of 2 brachium pontis breaker in middle devices and diode; Switch drive is connected to switching device driving stage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111551829A (en) * | 2019-12-27 | 2020-08-18 | 广东电网有限责任公司电力科学研究院 | Oscillation type operation impulse voltage generator, impulse withstand voltage detection system and method |
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| CN105024585B (en) * | 2015-08-05 | 2017-11-14 | 南京国电环保科技有限公司 | Tandem pulse voltage generating means and method |
| CN105334361A (en) * | 2015-11-26 | 2016-02-17 | 云南电网有限责任公司电力科学研究院 | All-solid-state nanosecond pulse generation system |
| CN108463022A (en) * | 2017-02-17 | 2018-08-28 | 周徐达 | A kind of multi-layer ceramic capacitance constant current driver circuit for LED |
| CN108462482B (en) * | 2018-02-10 | 2020-10-27 | 西安交通大学 | Device and method for generating bipolar high-voltage pulse |
| CN109283464B (en) * | 2018-10-18 | 2021-01-19 | 许继集团有限公司 | Thermal running test device for thyristor converter valve |
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| US7301250B2 (en) * | 2004-05-04 | 2007-11-27 | Stangenes Industries, Inc. | High voltage pulsed power supply using solid state switches |
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| US6066901A (en) * | 1998-09-17 | 2000-05-23 | First Point Scientific, Inc. | Modulator for generating high voltage pulses |
| CN102035378A (en) * | 2009-09-28 | 2011-04-27 | 复旦大学 | All solid state high-voltage power supply with positive and negative pulse outputs |
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